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Merge pull request #4 from nearprotocol/improve-string-handling

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Improve performance of assembly JSON by improving string handling
This commit is contained in:
Vladimir Grichina
2019-03-26 15:33:14 -07:00
committed by GitHub
parent 8b0aa58c49 1aca8f6b4c
commit 2af3623ae1
4 changed files with 84 additions and 33 deletions
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15
assembly/decoder.ts
View File

@ -196,16 +196,21 @@ export class JSONDecoder<JSONHandlerT extends JSONHandler> {
private readString(): string {
assert(this.readChar() == '"'.charCodeAt(0), "Expected double-quoted string");
let savedIndex = this.state.readIndex;
let stringParts: Array<string> = new Array<string>();
let stringParts: Array<string> = null;
for (;;) {
let byte = this.readChar();
assert(byte >= 0x20, "Unexpected control character");
if (byte == '"'.charCodeAt(0)) {
stringParts.push(
String.fromUTF8(this.state.buffer.buffer.data + savedIndex, this.state.readIndex - savedIndex - 1));
let s = String.fromUTF8(this.state.buffer.buffer.data + savedIndex, this.state.readIndex - savedIndex - 1);
if (stringParts == null) {
return s;
}
stringParts.push(s);
return stringParts.join("");
}
if (byte == "\\".charCodeAt(0)) {
} else if (byte == "\\".charCodeAt(0)) {
if (stringParts == null) {
stringParts = new Array<string>();
}
if (this.state.readIndex > savedIndex + 1) {
stringParts.push(
String.fromUTF8(this.state.buffer.buffer.data + savedIndex, this.state.readIndex - savedIndex - 1));

8
assembly/encoder.ts
View File

@ -13,11 +13,9 @@ export class JSONEncoder {
// TODO: Write directly to UTF8 bytes
let result = this.toString();
let utf8ptr = result.toUTF8();
let buffer = new Uint8Array(result.lengthUTF8);
for (let i = 0; i < buffer.length; i++) {
buffer[i] = load<u8>(utf8ptr + i);
}
return buffer.subarray(0, buffer.length - 1);
let buffer = new Uint8Array(result.lengthUTF8 - 1);
memory.copy(buffer.buffer.data, utf8ptr, buffer.byteLength);
return buffer;
}
toString(): String {